Q7 of 176 Page 8

Which term of A.P. 3, 8, 13, 18, ... is 88?

Here, a = 3, d = 8 – 3 = 5 and an = 88


To find : n


We have,


an = a + (n – 1)d


⇒ 88 = 3 + (n – 1) × (5)


⇒ 88 = 3 + 5n – 5


⇒ 88 = –2 + 5n


⇒88 + 2 = 5n


⇒ 90 = 5n


⇒ n = 18


Therefore, the 18th term of the given AP is 88.


More from this chapter

All 176 →
7

Which term of the A.P. 5, 9, 13, 17, ... is 81?

 7

Which term of the A.P. 14, 9, 4, – I, – 6, ... is – 41 ?

 7

Which term of A.P. is 3?

 7

Which term of A.P. 3, 8, 13, 18, ..., is 248 ?